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| physical object > artifact > device > instrument > fusion device > pinch machine | 
| pinch machine comparison table | |
| Subject | has definition | 
|---|---|
| theta pinch | A fusion device in which the magnetic field runs parallel to the plasma column. It is a long cylindrical tube enclosed in a one-turn magnet coil. | 
| z pinch | A diffuse toroidal pinch in which the magnetic field runs around the plasma column. | 
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